Concrete mixer



Och 6, 1931. s, SHAFER, JR 1,826,289

CONCRETE MIXER Filed Jan. 17, 1929 3 Sheets-Sheet l I INVEN TOR.

Sam as? Shajecfi S. SHAFER. JR

CONCRETE MIXER Oct. 6, 1931.

Filed Jan. 17. 1929 5 Sheets-Sheet 2 Oct. 6, 1931.

S. S HAFER. JR

QONCRETE MIXER Filed Jan. 17, 1929 3 Sheets-Sheet 5 INVENTOR. SamueZ ,Shafer; J2:

ATTO

Patented Oct. 6, 1931 UNITED STATES PATENT OFFICE- 3 SAMUEL sHArEn, JR, or IVELWAUKEE, wrseensin, ASSIGNOR gro CHAIN BELT eon- PANY, or MILWAUKEE, WISCONSIN, A eonroneriosi or Wisconsin CONCRETE MIXER Application'filed January 17, 192,9, Serial No, 3333714,

This invention relates to concrete mixers and more particularly to an automatic brake release for such apparatus, and has for one of its objects to provide a device of this character which will be simple in construe tion, comparatively inexpensive to menu.- facture, and more eflicient in use than those which have been heretofore proposed.

In certain types of concrete mixers it is customary to provide a power operated charging ship for the miXer-drlunavhieh skip is elevated means of a cable Wound upon .a suitable winding drum, which latter is driven from the engine .or othersouree oi power of the mixer. A clutch is commonly 'interposedhetween the source of power the winding drum in order that-the latter may be actuated at =Will,.and.the&lrun,1 is also provided with a braking surface which isen gaged by a suitable brake member usually in the form of an annular hand.

In previous :constructions it has been the eom-mon practice to so adjust he brak band upon the lQBHlQHClIUFIILhhELlJ it will exert 25 suflic-ient friction thereon to .hold the Winding drum against rotation Whenever the power transmitting clutch is disengaged and no means has been provided for releasing the brake hand from thedruin during the windo ing operation. It therefore fiollows that the liningoftheEhrakeband drags uponthe triction surfaced" the Winding druinrluring the ,tlHIGhhQ POWSI is applied and the skipelevatring cable is being Wound up, With the result 95 that the-Wear uponthe parts is exeessive and they must be frequently renewed. I

ltiis the principal object of the present in- Vention to provide means whereby thebra'king 'lneinber may be automatically released froln engagement with the loraking surface ofthe Winding drum Wheneverthe zpower transmitting clutch is engaged for the-purpose of Winding up the skip cable, and to insure the re-engageinent of the brake meIn-r -45 berwiththe drum surface*Whentheclutch is disengaged. Provisionis also made-whereby the brake :hand may he released manually .When'theclutch is disengaged, in orderthat the (ship maybe ilowered. Furthermore, the

' m0 rparts are automatically looked; in each posipl ed.

ti n through he u e sf toggle mech m will spi ssrinsrs fully be ow i i With the abo e and b hs shissts in i which l appe s th d s p s P sssd.s.,t1. in en ion cons sts in he 9 sts tells of cons ruction and so hh nsti i parts more hi ly he ina ter d ss s d a psrt suls ly pointed ut in t e spi Befe r n-s s h ssssmp ny g dr g to srniiss part of hi spssifi st sn, n wh i lik rsfsrsns sea -esters de ignat l k p t in a l the vi s: i T

Fig- .1 is a frsg i snts y si e s rs l v swpfs conc et ith the pre e s tls app i d h rs shis 2 is e la ged l s e s t tq View part y 1 10 91 sway sh ing he P t st tuting the h siit esih th os t sns y assume When the clutch is engaged andt he L winding d um is psrs hl o .3 i s a view simila to Fig. 2 but showing th c u h dis ag d a t i h ips s end e vat ens s of the parts shown in Fig. 2 as seen from the right iots id fig r iand s Y Fig. 5 is an enlarged ,detai'l sectional view ta e approximate y Q thsplsn ind t y the lihs 5: g- 2, hh g Ji th fl rl stion of t s srrs s Ret ini g msrs part cul r y t the s is draw ngs, 10 indisstss slissrh m t sslly a sk p abl wind ng drums i sqn sts m x .oi vvsl hnowntyss W ish s l q lv m u ted 1 1 0. th shaft 7. 71 end is prsv dsd it a braking-su face hosp tabl .Qhit 13 s mounted upo thsssid sha 11 esdi adapted to .trans nitpo s thsr sm t th d hm ,10 when h parts e 1 l h9,P le 9- sss trated in Figs. 1 and 2. l

'llhsm0vs smsmhs ifihs dutc is sdsp ed to be shi t d b mean sf sshiftins f '14 which is rigid y c r ied p n s sks i l5 jsurn led i1 .s'..hss. 'i g h si hst ,6 C d 1 F iramsim mhs l s th m xe 2 nd (-ssid shaft 1 a so rss r ss as slst asps tst s lleve 18ibvis a-1 s of whic thss ssh h sh may :h shifited by .hhl V -t irdsu vsshls s l sls i ligid y &

ried by the rock shaft 15 and has a connection 20 by means of which the clutch may be automatically shifted from engaged to disengaged position when the charging skip 21 reaches the position shown in broken lines in Fig. 1. The levers 14. 18 and 19, as above stated. are all rigidlv connected with the, rock shaft 15. and the whole assembly may be referred to as the clutch operating mechanism.

Surrounding the braking surtaee 12 of the winding drum 10 is a brake hand 22 having a suitable f iction lining tor engaging the sa d braking surface 12. one end 2.4 of which hand is rigidly connec ed to a supporting bracket 25 carried by the trame member 213. As will be clear f om Fig. 4 t e said and extends around the b aking surface o the drum and its other end is connected to a vertieallv dis osed rod .217 which slidal ilv eJtPUflS through the bracket and pa through the brake operating leve as ('learlv shown in Figs. 1. and 3. The lower projecting end of the rod 27 is provided with adjusting nuts by means ot which the compression of a, spring t) may he ontrolled. Sa d spring" 30. as wil he clear f om Figs. 9 a d surrounds he rod 97 and is int rposed, bet een the bracket 25 and the u er s rtaee ot the hrake lever thereliv alwe s ('(PHUQ pressure upon the said k ever which s transmitted threu h the adiust ng nuts o th od 9.7 and. to the brake hen d therehv alwavs tending to keep he b ake linin in trietional engagemen with th braking surtaee 12.

The brake lever F28 is ri reek shaft 3 mounted in a which i s also carr ed hv the trame member 96. as will be clear trom the d awings. aid hrake lever is pr vided with evteusion in which is mounted an adiusting scr w 34- having a lock nu 35. the purpo e of whi h wi l ap ear m o e el earlv below.

Leoselv mounted on the ock sh att 31 is an intermed ate leve or arm 36. th tree end of which is connected to the clutch lever or arm 9 bv means at a togg e ink 37. As clearlv shown in the r v in s the s i tog l ink is nivotallv connected to the intermediate lever 36 as at 38 and to the clutch lever or arm 19 at 39. The intermediate lever 36 is provided. ith a late allv project ng lug 40. the under surface oi wh ch is adapted o rest upon the upper projectiu (r en d ot the a diustmentscrew 34 carried by the projection 33 ot the brake lever 38. i

The. operation of the device is as follows:

A ssuming that the parts, are in the positions shown in Fig. whi h is their normal position. with the clutch l?) disengaged. it will be noted that the brake lever 98 is somewhat downwardly inclined under the ompression of the spring whe eby the lining of the brake member 522 has been ti ght v applied to the braking surface 12 of the drum. 10. It

gidlv connected to av hear ng bracket thus results that when the clutch is in this disengaged position the brake has been applied by the pressure of the brake spring If the clutch is now engaged through pulling down lever 18 to the position shown in Figs. 1 and 2. the arm 19 of the clutch operating assembly will be swung in a counterclockwise direction to the position shown in Fig. 2 and will carry with it the toggle link 37 which latter movement will cause a depression of the intermediate link 36 as will be readily understood. This movement will be transmitted through the lug 40 of the intermediate link through the adjusting screw 34 and thence to the brake lever 28, with the result that this latter lever will be rocked in a clockwise direction against the spring 30. thereby relieving its pressure upon the brake hand rod 27 and consequently relieving the friction of the brake lining upon the surface 12.

Tt thus follows that whenever the clutch is engaged the brake will he released and. of course. when the parts are positions shown in Fig. 3 either through the manual operation of the clutch lever 18 or through the automatic operation of the connection 20. the spring 30 will he again allowed to apnlv the brake to the. drum. It will he noted that. when the parts are in the position shown in Fig. 2. with the center of the pivot 39 swung to the right. of a line drawn through the centers of the rock shaft 15 and pivot 38. thev will be locked in such position. as any attempt to depress the brake lever 28. either hv the spring 30 or by manual operation. will he resisted through the parts 34. 40. 36. 38. 37. 39. 19. .15. 14 and clutch 13. In other wo ds anv attempt to applv the brake when the clutch is engaged will only result in additional pressure being averted upon the clutch plates without its beng possible to bring the brake lining into en agement with the drum.

It will also he noted that the connection between the brake lever F28 and the intermediate lever 36 is non-rigid in that the lug 40 merely rests upon the projecting end of the adjusting set screw 34. so that it is possible to raise the brake lever 28 in a clockwise direction when the parts are in the positions shown in Fig. 3. It. thus results that the brake may be released manually while the clutch is disengaged which. of course. is essential. for the purpose of lowering the skip after it has reached its highest position and the clutch thrown out.

\Vhile one form of the invention has been illustrated and described. it is obvious that those skilled in the art may vary the details of construction as well as the precise arrangement of parts without departing from the spirit of the invention, and therefore it is not returned to their 1 wished to be limited to the above disclosure except as may be required by the claims.

WVhat is claimed is:

1. The combination With a rotatable element having a braking surface, a clutch for transmitting power to said element, a brake member for engaging said braking surface to prevent rotation of said element, a control lever for said clutch, and a control lever for said brake member, of an intermediate lever engaging said brake lever adapted to transmit motion to said brake lever in one direction only; and a toggle link connecting said clutch and intermediate levers.

2. The combination with a rotatable element having a braking surface, a clutch for transmitting power to said element, a brake member for engaging said braking surface to prevent rotation of said element, resilient means normally causing said brake member to engage said braking surface, a control lever for said clutch, and a control lever for said brake member, of an intermediate lever;

a toggle link connecting said clutch and intermediate levers; and a non-rigid adjustable connection between said intermediate and brake levers, adapted to transmit motion to said brake lever in one direction only in opposition to the pressure of said resilient means, said connection permitting of independent manual operation of said brake lever to release said brake.

3. In a. concrete mixer, the combination of a reversible cable winding drum provided With a braking surface; a clutch for transmitting power to said drum; a brake member for engaging said braking surface to prevent rotation of said drum; a manually operable lever for engaging and disengaging said clutch; a manually operable lever for applying and releasing said brake member to and from said braking surface; resilient means normally urging said braking member toward said braking surface; an intermediate lever operable by said clutch operating lever, and having an adjustable non-rigid connection with said brake operating lever for transmitting motion from said clutch op erating lever to said brake operating lever only when the former is moved toward clutch-engaging position, whereby the brake member will be automatically released when the clutch is engaged; and automatically locking connections between said clutch operating lever and said intermediate lever for preventing movement of the latter and of the brake operating lever to brake applying position when the clutch is engaged.

SAMUEL SHAFER, JR. 

